Electrical protective device.



P."B. 000K.

ELECTRICAL PROTECTIVE DEVICE.

APPLICATION FILED MAY 10, 1911.

1,086,028, Patented Feb.3, 1914.

; UNITED rmx B. coon, or cmcaso, rumors.

ELECTRICAL. PROTECTIVE DEVICE.

Specification of Letters Patent.

Application filed May 10, 1911. Serial No. 626,386.

Patented Feb. 3,1914.

To all whom it may concern.-

Be it known that I, FRANK B. 0001:, a

citizen of the United States, residing at Chiplate of the unit.

oago, in the county of'Gook and State of 1ll1nois,.have invented certain new and use: ful Improvements in Electrical Protective Devices, of which the following is especification.

This invention relates to electrical protective devices and refers more particularly to a protector unit of'the class disclosed in my prior Patent No. 990,229, issued April 25, 1911, such protector funits bein adapted to be used upon cable terminals an in similar situations. a

The objectof thepresentinvention is to provide improved means for. mounting the fuse-holding spring members upon the base- In the. accompanying drawings, Figure 1 arts in section, 'of a is a plan view, with rotector unit embodymg thie features of m e e e invention. .Fig. 2 is and vation thereo the fuses being removed, Fig, 3 is alongitudinal section on line 3'3 of Fig. 2. Fig. 4 isa fragmentary under Side 'view of the fuse sup orting clips and attaching block at one en of the device. I

The present embodiment of my invention comprises a base-plate 4 which is adapted to be. secured to a suitable supporting late A, the latter preferably taking the orm shown in Fig. 1 so that it may be used as one side of a cable terminal in a well known manner. The means for attachin the baseplate 4 to the plate A may be $11 stantially the same as that shown in my said patent,

saidmeans comprising hooks a on the plate A. arranged to overlie one end portion of the base plate, and hollow'binding posts b" art of. the lse'cure the sleeve 16'- to said Tangs l9 punched upwardly from the baseforming a permanent terminal plate A, said binding posts being adapted to be gripped by spring fingers ingibetween them a pair of inclosed fuses8. Between each of the members 6' and-the plate'5 is frictionally held. asuitable li ht upon the protector unit. Insulating sleeves c serve to insulate the binding posts I; from adjacent parts. The plate Ais adapted to support a plurality-of.the protector units 5 at its side "edges;-

b. The base-plate 4 has openings 4 therein a l to receive-the binding posts 6.

The means for securmg the pair of spring members 6, to'the base-plate comprises a .block 10.01? insulating material such as hard rubber, the members 6 being securely fixed thereto in any suitable way, preferably that disclosed in my aforesaid patent. Within the block 10 is embedded a. nut 11. screw 12 passing upwardly through an opening m the base-plate 4 is adapted to engage the embedded nut 11 to secure the block 10 firmly to the base-plate. Preferably the base-plate has one or more tangs 13 pun'ohed upwardly therefrom, said tangs being ar rangedto lie in recesses 14 formed in the bottom of the block'lO for the purpose of preventing rotation or twisting movement of said block with reference to (the baseplate 4. The metal of the base-plategatthe edge of the opening for thescrew 121'1'nay be turned up as shown in Fig. 3, if desired,

so that the head of said screwwilllie flush with the face of the base-plate. Preferably a sheet 15 of mica or other similar "I'IitI-terial reduced in diameter to forma, shoulder 1.7, said reduced end passing through an open s ing in the base-plate 4.- and having a nut-18f I threaded upon its inner end, said nut bearv ing against the base-plate 4 at the side opposite to the shoulder 17 and servin to firmly se-plate.

.plate and. lying -'in recesses formed in the shoulder 17 serve to prevent rotation or twisting movement of the sleeve 16 with reference to the base-plate 41 -20 is a sheet of mica or similar material interposed between the shoulder 17 and the adjacent face of thevbase-plate. If desired the spring member 7 may have short sleeves 21 fixed thereto, said sleeves being internally threaded to receive binding screws 22 to facilitate the attachment of electric wires 1], which maybe inserted through the insulat ing sleeve 16 from the inside of the cable terminal. Another wire e may be suitably attached to the binding post I).

I claim as my invention:

1. In a device of the character described, the combination of a base-plate, a fuse-supporting device, and means for securing said device to said base-plate comprising an insulating member to which said device is fixed, a metallic nut embedded in said member, a screw passing through an opening in said base-plate and engaging said nut, and means for reventing rotation of said insulalting mem r with reference to said basep ate.

2. In a device of the character described, the combination of a base-plate, a fuse-supporting device and means for securing said device to said base-plate comprising an insulating member to which said device is secured, a metallic nut embedded in said member, a screw passin through an openin in said base-plate an engaging said nut, an means on said base-plate engaging said insulating member to prevent rotation thereof. 7

3. In a device of the character described, the combination of a base-plate, a fuse-suporting device, and means for securing said evice to said base-plate comprising an insul-ating member to which said device is fixed, means for attaching said insulating member to said base-plate, and means for preventing rotation of said member with reference to said base-plate.

4:- In a device of the character described, the combination of a base-plate, a fuse-supporting device, an. insulating member to which said device is fixed, means for attaching said member to said base-plate, and tangs struck u from said base-plate and engaging said insulating member for pre venting rotation of the latter.

5. In a device of the character described, the combination of a base-plate, a fuse-supporting device, an insulating member to which said device is fixed, a nut embedded in said member, a screw passing through an opening in said base-plate and engaging said nut, said member having a recess in one face, and tangs struck up from said base-plate and lying in said recess.

6. A device of the character described comprising a base plate, a fuse-supporting device, an insulating member upon which said fuse supportin device is mounted, a

nut fixedly embedded in said insulating member at the side adjacent to said base plate, said nut being insulated from said fuse-supporting device by said insulating member, the latter having a recess surrounding said nut, said base plate having an opening registering with said nut and having the material surrounding said opening bent laterally to lie in said recess in the insulating member, said laterally bent portion forming a countersink in the base plate, and a screw passing through-said openin and threaded in said nut, the head of said screw lying in said countersink flush with the base plate.

In testimony whereof I hereby afiix my signature in the presence of two witnesses.

FRANK B. COOK. Witnesses:

JNO. F. TOMPKINS, A. B. PARnIsn.

Gopiea of thin patent may be obtained for five cents each, by addressing the Commissioner of Patenia.

Washington, D. G. 

